You've found the house you love, inspected the kitchen, admired the garden, and you're ready to make an offer. But have you looked at the switchboard? Checked the wiring? Noticed the ceramic fuses?
Electrical defects are among the most expensive problems a home buyer can inherit — and among the easiest to miss during a standard building inspection. A pre-purchase electrical inspection can save you tens of thousands of dollars and potentially prevent you from buying a home with hidden safety hazards.
Why Standard Building Inspections Aren't Enough
A general building and pest inspection covers electrical at a very basic level. The inspector will note obviously visible issues — a damaged power point, a missing smoke alarm, a visibly old switchboard — but they don't:
- Test circuit insulation resistance (the only way to assess wiring condition without opening walls)
- Test safety switch operation and trip times
- Check circuit loading and distribution
- Assess switchboard compliance in detail
- Identify non-compliant DIY electrical work
- Provide estimated remediation costs
A dedicated electrical inspection by a licensed electrician fills these gaps. It takes 1–2 hours and provides a detailed report that tells you exactly what you're buying into electrically.
What We Check During a Pre-Purchase Electrical Inspection
Switchboard Assessment
- Type and age: Is it a modern circuit breaker board or an outdated ceramic fuse board? Bakelite or metal enclosure?
- Safety switches (RCDs): Are they present? Are they on all circuits or just some? Do they trip correctly when tested?
- Circuit breaker ratings: Are they appropriate for the cables they protect?
- Labelling: Is the board clearly labelled so you can identify what each circuit serves?
- Capacity: Is the board full, or is there room for future additions (solar, EV charger, air conditioning)?
- Surge protection: Is an SPD installed?
Wiring Assessment
- Insulation resistance testing: Every circuit is tested with a megger (insulation resistance tester) to determine the condition of cable insulation. This is the key test — it reveals deteriorated wiring that can't be seen without opening walls
- Visual inspection: We check accessible wiring in the roof space, under the floor, and in the switchboard for physical condition — cracking, rodent damage, poor connections
- Cable type: Is it modern TPS cable, older PVC, or dangerous rubber-insulated cable?
- Earth continuity: Is the earthing system intact and properly connected?
Power Points and Switches
- Polarity testing — ensuring active and neutral aren't reversed (a dangerous and surprisingly common fault)
- Physical condition — cracked, discoloured, loose, or warm outlets
- Adequate quantity for the home's size (a lack of points often indicates heavy extension lead use)
- Earthing — checking that all power points have a functioning earth connection
Smoke Alarms
- Are they present in all required locations?
- Are they hardwired or battery-only?
- Are they within their 10-year service life?
- Do they function when tested?
Non-Compliant Work
One of the most valuable aspects of a pre-purchase electrical inspection is identifying non-compliant DIY electrical work. This is more common than you'd think — previous owners who fancied themselves handy may have added power points, run circuits, or modified the switchboard without a licence.
Signs of non-compliant work include:
- Cables not properly secured or supported
- Junction boxes that are accessible or poorly terminated
- Circuits without corresponding certificates of compliance
- Mismatched or inappropriate cable types
- Power points or light fittings installed in non-standard ways
Non-compliant work creates safety risks, insurance issues, and potential problems when you try to sell the property later.
Common Defects in Sydney Properties by Era
Pre-1960s (Federation, Californian Bungalow)
- Rubber-insulated wiring — almost certainly past its service life
- No earthing on power circuits
- Ceramic fuse boards
- Inadequate circuit capacity for modern loads
- Estimated remediation: $15,000–$30,000+ (full rewire + switchboard)
1960s–1970s
- Early PVC cable that may be deteriorating, especially in roof spaces
- Possible aluminium wiring (fire risk at connections)
- Outdated switchboards, possibly with asbestos backing
- Estimated remediation: $5,000–$20,000 (partial or full rewire + switchboard)
1980s–1990s
- Wiring likely in serviceable condition
- Switchboard may lack full RCD protection
- Smoke alarms may be non-compliant with current standards
- Estimated remediation: $1,500–$5,000 (switchboard upgrade + smoke alarms)
2000s–Present
- Generally compliant, but check for DIY modifications
- Older smart home or security systems that need updating
- Estimated remediation: $0–$2,000 (minor updates if any)
The Inspection Report
After inspection, you'll receive a detailed written report that includes:
- Overall assessment of the electrical installation
- Specific defects identified, categorised by severity (critical, major, minor)
- Photos of defects and areas of concern
- Estimated costs for remediation of each defect
- Recommendations for immediate action vs. planned upgrades
This report is a powerful negotiation tool. You can present it to the vendor or their agent with specific costs, requesting either a price reduction or rectification before settlement.
Frequently Asked Questions
How much does a pre-purchase electrical inspection cost?
A pre-purchase electrical inspection in Sydney typically costs $300–$600 depending on the size and age of the property. This includes switchboard inspection, circuit testing, visual assessment of accessible wiring, safety switch testing, and a written report. It's a small investment compared to potentially buying a property that needs $10,000–$30,000 in electrical remediation.
Is a general building inspection enough, or do I need a separate electrical inspection?
A general building inspection covers electrical at a very surface level — the inspector will note obvious issues but won't test circuits, check wiring condition, or assess switchboard compliance in detail. A dedicated electrical inspection by a licensed electrician is far more thorough and is strongly recommended for any property over 20 years old.
What are the most common electrical defects in older Sydney homes?
The most common defects we find are: outdated switchboards with ceramic fuses and no safety switches, deteriorated wiring (rubber-insulated cable in pre-1970s homes), insufficient power points leading to overloaded circuits and extension leads, non-compliant DIY electrical work, and missing or non-functional smoke alarms.
Can I use electrical defects to negotiate the purchase price?
Absolutely. A detailed electrical inspection report with estimated remediation costs gives you concrete negotiation leverage. A switchboard upgrade ($1,500–$2,500), rewiring ($12,000–$20,000+), or bringing non-compliant work up to standard can justify significant price reductions or a requirement for the seller to rectify before settlement.
Should I get an electrical inspection for a new-build house?
Even new builds benefit from an independent electrical inspection before handover. We occasionally find defects in new construction: missing RCDs, incorrectly wired circuits, insufficient power points versus the plans, and poor workmanship. It's easier to have the builder rectify issues before you take possession.
Book a Pre-Purchase Electrical Inspection
Buying in Sydney's Eastern Suburbs? Call Randwick Electrical on 0413 707 758 for a thorough pre-purchase electrical inspection. We provide a detailed written report with photos and cost estimates — usually within 24 hours of the inspection — so you have the information you need before your cooling-off period expires.